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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 807 · 40 questions
TalentJR

The trick (Digits add to the 9 table): Add the digits you can see. Find the next number in the 9 table (9, 18, 27 …) above that total. The hidden digit is the difference. (Any number minus its digit sum is in the 9 table too.)

NameDateTime takenScore ___ / 40
  1. 1.Take 48 and take away the sum of its digits. What do you get?
  2. 2.2?96 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.13?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.510? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.206? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.Take 96 and take away the sum of its digits. What do you get?
  7. 7.Take 67 and take away the sum of its digits. What do you get?
  8. 8.15?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 52 and take away the sum of its digits. What do you get?
  10. 10.4?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.637? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 17 and take away the sum of its digits. What do you get?
  13. 13.Take 95 and take away the sum of its digits. What do you get?
  14. 14.1?83 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.48?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.?452 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.?456 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.48?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.?763 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.?203 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.?272 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.2?09 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 90 and take away the sum of its digits. What do you get?
  24. 24.2?91 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.1?87 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.829? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.?186 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.6?27 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.?57 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.15?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.?552 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.?518 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.?610 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Take 15 and take away the sum of its digits. What do you get?
  35. 35.2?49 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.657? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.8?05 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Take 12 and take away the sum of its digits. What do you get?
  39. 39.6?42 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 33 and take away the sum of its digits. What do you get?

Answer key

  1. 36
  2. 1
  3. 6
  4. 3
  5. 1
  6. 81
  7. 54
  8. 2
  9. 45
  10. 7
  11. 2
  12. 9
  13. 81
  14. 6
  15. 8
  16. 7
  17. 3
  18. 6
  19. 2
  20. 4
  21. 7
  22. 7
  23. 81
  24. 6
  25. 2
  26. 8
  27. 3
  28. 3
  29. 6
  30. 3
  31. 6
  32. 4
  33. 2
  34. 9
  35. 3
  36. 9
  37. 5
  38. 9
  39. 6
  40. 27

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